| Message ID | 20231017193145.3198380-5-Frank.Li@nxp.com |
|---|---|
| State | New |
| Headers | show |
| Series | PCI: layerscape: Add suspend/resume support for ls1043 and ls1021 | expand |
On Tue, Oct 17, 2023 at 03:31:45PM -0400, Frank Li wrote: > ls1043a add suspend/resume support. > Implement ls1043a_pcie_send_turnoff_msg() to send PME_Turn_Off message. > Implement ls1043a_pcie_exit_from_l2() to exit from L2 state. > Please use the suggestion I gave in patch 2/4. > Signed-off-by: Frank Li <Frank.Li@nxp.com> > --- > > Notes: > Change from v2 to v3 > - Remove ls_pcie_lut_readl(writel) function > > Change from v1 to v2 > - Update subject 'a' to 'A' > > drivers/pci/controller/dwc/pci-layerscape.c | 86 ++++++++++++++++++++- > 1 file changed, 85 insertions(+), 1 deletion(-) > > diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c > index 4b663b20d8612..9656224960b0c 100644 > --- a/drivers/pci/controller/dwc/pci-layerscape.c > +++ b/drivers/pci/controller/dwc/pci-layerscape.c > @@ -41,6 +41,15 @@ > #define SCFG_PEXSFTRSTCR 0x190 > #define PEXSR(idx) BIT(idx) > > +/* LS1043A PEX PME control register */ > +#define SCFG_PEXPMECR 0x144 > +#define PEXPME(idx) BIT(31 - (idx) * 4) > + > +/* LS1043A PEX LUT debug register */ > +#define LS_PCIE_LDBG 0x7fc > +#define LDBG_SR BIT(30) > +#define LDBG_WE BIT(31) > + > #define PCIE_IATU_NUM 6 > > #define LS_PCIE_DRV_SCFG BIT(0) > @@ -227,6 +236,68 @@ static int ls1021a_pcie_exit_from_l2(struct dw_pcie_rp *pp) > return 0; > } > > +static void ls1043a_pcie_send_turnoff_msg(struct dw_pcie_rp *pp) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + struct ls_pcie *pcie = to_ls_pcie(pci); > + u32 val; > + > + if (!pcie->scfg) { > + dev_dbg(pcie->pci->dev, "SYSCFG is NULL\n"); > + return; > + } Why scfg is optional for this SoC and not for the other one added in patch 2/4? > + > + /* Send Turn_off message */ > + regmap_read(pcie->scfg, SCFG_PEXPMECR, &val); > + val |= PEXPME(pcie->index); > + regmap_write(pcie->scfg, SCFG_PEXPMECR, val); > + In my previous review, I asked you to use a common function and just pass the offsets, as the sequence is same for both the SoCs. But you ignored it :/ > + /* > + * There is no specific register to check for PME_To_Ack from endpoint. > + * So on the safe side, wait for PCIE_PME_TO_L2_TIMEOUT_US. > + */ > + mdelay(PCIE_PME_TO_L2_TIMEOUT_US/1000); > + > + /* > + * Layerscape hardware reference manual recommends clearing the PMXMTTURNOFF bit > + * to complete the PME_Turn_Off handshake. > + */ > + regmap_read(pcie->scfg, SCFG_PEXPMECR, &val); > + val &= ~PEXPME(pcie->index); > + regmap_write(pcie->scfg, SCFG_PEXPMECR, val); > +} > + > +static int ls1043a_pcie_exit_from_l2(struct dw_pcie_rp *pp) > +{ > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > + struct ls_pcie *pcie = to_ls_pcie(pci); > + u32 val; > + > + /* > + * Only way let PEX module exit L2 is do a software reset. Same comment applies as patch 2/4. - Mani
On Thu, Nov 02, 2023 at 11:09:00PM +0530, Manivannan Sadhasivam wrote: > On Tue, Oct 17, 2023 at 03:31:45PM -0400, Frank Li wrote: > > ls1043a add suspend/resume support. > > Implement ls1043a_pcie_send_turnoff_msg() to send PME_Turn_Off message. > > Implement ls1043a_pcie_exit_from_l2() to exit from L2 state. > > > > Please use the suggestion I gave in patch 2/4. > > > Signed-off-by: Frank Li <Frank.Li@nxp.com> > > --- > > > > Notes: > > Change from v2 to v3 > > - Remove ls_pcie_lut_readl(writel) function > > > > Change from v1 to v2 > > - Update subject 'a' to 'A' > > > > drivers/pci/controller/dwc/pci-layerscape.c | 86 ++++++++++++++++++++- > > 1 file changed, 85 insertions(+), 1 deletion(-) > > > > diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c > > index 4b663b20d8612..9656224960b0c 100644 > > --- a/drivers/pci/controller/dwc/pci-layerscape.c > > +++ b/drivers/pci/controller/dwc/pci-layerscape.c > > @@ -41,6 +41,15 @@ > > #define SCFG_PEXSFTRSTCR 0x190 > > #define PEXSR(idx) BIT(idx) > > > > +/* LS1043A PEX PME control register */ > > +#define SCFG_PEXPMECR 0x144 > > +#define PEXPME(idx) BIT(31 - (idx) * 4) > > + > > +/* LS1043A PEX LUT debug register */ > > +#define LS_PCIE_LDBG 0x7fc > > +#define LDBG_SR BIT(30) > > +#define LDBG_WE BIT(31) > > + > > #define PCIE_IATU_NUM 6 > > > > #define LS_PCIE_DRV_SCFG BIT(0) > > @@ -227,6 +236,68 @@ static int ls1021a_pcie_exit_from_l2(struct dw_pcie_rp *pp) > > return 0; > > } > > > > +static void ls1043a_pcie_send_turnoff_msg(struct dw_pcie_rp *pp) > > +{ > > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > > + struct ls_pcie *pcie = to_ls_pcie(pci); > > + u32 val; > > + > > + if (!pcie->scfg) { > > + dev_dbg(pcie->pci->dev, "SYSCFG is NULL\n"); > > + return; > > + } > > Why scfg is optional for this SoC and not for the other one added in patch 2/4? No, it is not optional for this SoC. This check can be removed as your previous comments about 2/4. > > > + > > + /* Send Turn_off message */ > > + regmap_read(pcie->scfg, SCFG_PEXPMECR, &val); > > + val |= PEXPME(pcie->index); > > + regmap_write(pcie->scfg, SCFG_PEXPMECR, val); > > + > > In my previous review, I asked you to use a common function and just pass the > offsets, as the sequence is same for both the SoCs. But you ignored it :/ > Sorry, I will fixed it at next version. > > + /* > > + * There is no specific register to check for PME_To_Ack from endpoint. > > + * So on the safe side, wait for PCIE_PME_TO_L2_TIMEOUT_US. > > + */ > > + mdelay(PCIE_PME_TO_L2_TIMEOUT_US/1000); > > + > > + /* > > + * Layerscape hardware reference manual recommends clearing the PMXMTTURNOFF bit > > + * to complete the PME_Turn_Off handshake. > > + */ > > + regmap_read(pcie->scfg, SCFG_PEXPMECR, &val); > > + val &= ~PEXPME(pcie->index); > > + regmap_write(pcie->scfg, SCFG_PEXPMECR, val); > > +} > > + > > +static int ls1043a_pcie_exit_from_l2(struct dw_pcie_rp *pp) > > +{ > > + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); > > + struct ls_pcie *pcie = to_ls_pcie(pci); > > + u32 val; > > + > > + /* > > + * Only way let PEX module exit L2 is do a software reset. > > Same comment applies as patch 2/4. > > - Mani > > -- > மணிவண்ணன் சதாசிவம்
diff --git a/drivers/pci/controller/dwc/pci-layerscape.c b/drivers/pci/controller/dwc/pci-layerscape.c index 4b663b20d8612..9656224960b0c 100644 --- a/drivers/pci/controller/dwc/pci-layerscape.c +++ b/drivers/pci/controller/dwc/pci-layerscape.c @@ -41,6 +41,15 @@ #define SCFG_PEXSFTRSTCR 0x190 #define PEXSR(idx) BIT(idx) +/* LS1043A PEX PME control register */ +#define SCFG_PEXPMECR 0x144 +#define PEXPME(idx) BIT(31 - (idx) * 4) + +/* LS1043A PEX LUT debug register */ +#define LS_PCIE_LDBG 0x7fc +#define LDBG_SR BIT(30) +#define LDBG_WE BIT(31) + #define PCIE_IATU_NUM 6 #define LS_PCIE_DRV_SCFG BIT(0) @@ -227,6 +236,68 @@ static int ls1021a_pcie_exit_from_l2(struct dw_pcie_rp *pp) return 0; } +static void ls1043a_pcie_send_turnoff_msg(struct dw_pcie_rp *pp) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct ls_pcie *pcie = to_ls_pcie(pci); + u32 val; + + if (!pcie->scfg) { + dev_dbg(pcie->pci->dev, "SYSCFG is NULL\n"); + return; + } + + /* Send Turn_off message */ + regmap_read(pcie->scfg, SCFG_PEXPMECR, &val); + val |= PEXPME(pcie->index); + regmap_write(pcie->scfg, SCFG_PEXPMECR, val); + + /* + * There is no specific register to check for PME_To_Ack from endpoint. + * So on the safe side, wait for PCIE_PME_TO_L2_TIMEOUT_US. + */ + mdelay(PCIE_PME_TO_L2_TIMEOUT_US/1000); + + /* + * Layerscape hardware reference manual recommends clearing the PMXMTTURNOFF bit + * to complete the PME_Turn_Off handshake. + */ + regmap_read(pcie->scfg, SCFG_PEXPMECR, &val); + val &= ~PEXPME(pcie->index); + regmap_write(pcie->scfg, SCFG_PEXPMECR, val); +} + +static int ls1043a_pcie_exit_from_l2(struct dw_pcie_rp *pp) +{ + struct dw_pcie *pci = to_dw_pcie_from_pp(pp); + struct ls_pcie *pcie = to_ls_pcie(pci); + u32 val; + + /* + * Only way let PEX module exit L2 is do a software reset. + * LDBG_WE: allows the user to have write access to the PEXDBG[SR] for both setting and + * clearing the soft reset on the PEX module. + * LDBG_SR: When SR is set to 1, the PEX module enters soft reset. + */ + val = ls_pcie_pf_lut_readl(pcie, LS_PCIE_LDBG); + val |= LDBG_WE; + ls_pcie_pf_lut_writel(pcie, LS_PCIE_LDBG, val); + + val = ls_pcie_pf_lut_readl(pcie, LS_PCIE_LDBG); + val |= LDBG_SR; + ls_pcie_pf_lut_writel(pcie, LS_PCIE_LDBG, val); + + val = ls_pcie_pf_lut_readl(pcie, LS_PCIE_LDBG); + val &= ~LDBG_SR; + ls_pcie_pf_lut_writel(pcie, LS_PCIE_LDBG, val); + + val = ls_pcie_pf_lut_readl(pcie, LS_PCIE_LDBG); + val &= ~LDBG_WE; + ls_pcie_pf_lut_writel(pcie, LS_PCIE_LDBG, val); + + return 0; +} + static const struct dw_pcie_host_ops ls_pcie_host_ops = { .host_init = ls_pcie_host_init, .pme_turn_off = ls_pcie_send_turnoff_msg, @@ -244,6 +315,19 @@ static const struct ls_pcie_drvdata ls1021a_drvdata = { .flags = LS_PCIE_DRV_SCFG, }; +static const struct dw_pcie_host_ops ls1043a_pcie_host_ops = { + .host_init = ls_pcie_host_init, + .pme_turn_off = ls1043a_pcie_send_turnoff_msg, +}; + +static const struct ls_pcie_drvdata ls1043a_drvdata = { + .pf_lut_off = 0x10000, + .pm_support = true, + .ops = &ls1043a_pcie_host_ops, + .exit_from_l2 = ls1043a_pcie_exit_from_l2, + .flags = LS_PCIE_DRV_SCFG, +}; + static const struct ls_pcie_drvdata layerscape_drvdata = { .pf_lut_off = 0xc0000, .pm_support = true, @@ -254,7 +338,7 @@ static const struct of_device_id ls_pcie_of_match[] = { { .compatible = "fsl,ls1012a-pcie", .data = &layerscape_drvdata }, { .compatible = "fsl,ls1021a-pcie", .data = &ls1021a_drvdata }, { .compatible = "fsl,ls1028a-pcie", .data = &layerscape_drvdata }, - { .compatible = "fsl,ls1043a-pcie", .data = &ls1021a_drvdata }, + { .compatible = "fsl,ls1043a-pcie", .data = &ls1043a_drvdata }, { .compatible = "fsl,ls1046a-pcie", .data = &layerscape_drvdata }, { .compatible = "fsl,ls2080a-pcie", .data = &layerscape_drvdata }, { .compatible = "fsl,ls2085a-pcie", .data = &layerscape_drvdata },
ls1043a add suspend/resume support. Implement ls1043a_pcie_send_turnoff_msg() to send PME_Turn_Off message. Implement ls1043a_pcie_exit_from_l2() to exit from L2 state. Signed-off-by: Frank Li <Frank.Li@nxp.com> --- Notes: Change from v2 to v3 - Remove ls_pcie_lut_readl(writel) function Change from v1 to v2 - Update subject 'a' to 'A' drivers/pci/controller/dwc/pci-layerscape.c | 86 ++++++++++++++++++++- 1 file changed, 85 insertions(+), 1 deletion(-)